Engine Control Module with Integral Auto Tune System – ’25 Softail

• ThunderMax ECM with Auto-Tune module mounts conveniently in place of the factory ECM and plugs in to the existing harness
• Utilizes wide-band oxygen sensors and works as a closed-loop control system to continuously self-adjust and properly tune the motorcycles air/fuel ratio for all riding conditions
• Easy installation: replace the factory ECM, install new oxygen sensors and harness, load the correct map for your bike, and ride
• Includes ThunderMax ECM with Auto-Tune Module, plug-in harness and two wide-band sensors, TMax software and communication USB cable, Quick-Start Easy Install and Comprehensive Users Manual, technical support and free software and updates

ThunderMax is an industry award winning, performance ECM designed specifically for EFI equipped Harley Davidson motorcycles. This highly advanced, stand-alone tuning system utilizes proprietary AutoTune technology with wide-band oxygen sensors to deliver unmatched performance and rideability. ThunderMax comes 100% assembled, ready to install with no wire-cutting or splicing required. Simply replace the factory ECM and oxygen sensors, load a map, and enjoy your new ride!

* Upgrade on OEM # 41001490

Tech Tips:-

Exhaust Note: On 2012up Softail & Dyna models and 2014up Sportster models, the OEM exhaust system has 12mm o2 ports. The factory 12mm exhaust system is not compatible with the 18mm ThunderMax oxygen sensors. Models with 12mm ports require the purchase an aftermarket exhaust system with 18mm ports.

Fitment Guide